Explanatory notes
… ‑ ‑ Of magnesium 2833.22 ‑ ‑ Of aluminium 2833.24 ‑ ‑ Of nickel 2833.25 ‑ ‑ Of copper 2833.27 ‑ ‑ Of barium 2833.29 ‑ … to this sub-Chapter, this heading covers the metal salts of sulphuric acid (H 2 SO 4 ) (heading 28.07), but excludes mercury sulphates which fall in heading 28.52, ammonium sulphate which, even …